Man facing 27 years for pizzeria slayings

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A 21-year-old alleged gangbanger faces up to 27 years in prison when he is sentenced next month for fatally shooting two men in a Mission district pizzeria three years ago.

As part of a deal struck with prosecutors in February, Andres Siordia pleaded guilty to two counts of voluntary manslaughter. He was originally charged with first-degree murder, but prosecutors said the plea deal was “the best possible outcome.”

“Some cases are open-and-shut cases, and this wasn’t one of them,” said Stephanie Ong Stillman, a spokeswoman for the District Attorney’s Office.

Siordia was 19 on Sept. 20, 2009, when he gunned down two men after chasing them into Papa Potrero’s Pizza, which was located at 24th and Potrero streets but has since closed down, prosecutors said.

Authorities said the killing was payback for the fatal shooting of a 21-year-old rival gang member two days before. Francisco Pena, 46, and Francisco Cornejo, 26, both of San Francisco, were killed and a third man was wounded by the gunfire.